Initial Commit

installer/Decky.appinstaller.template

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+<?xml version="1.0" encoding="utf-8"?>
+<AppInstaller
+    xmlns="http://schemas.microsoft.com/appx/appinstaller/2021"
+    Version="${VERSION}"
+    Uri="${PUBLIC_BASE_URL}/Decky.appinstaller">
+  <MainBundle
+      Name="com.elijahkuntz.Decky"
+      Publisher="${PUBLISHER_SUBJECT}"
+      Version="${VERSION}"
+      Uri="${PUBLIC_BASE_URL}/Decky_${VERSION}.msixbundle" />
+  <UpdateSettings>
+    <OnLaunch HoursBetweenUpdateChecks="12" ShowPrompt="true" UpdateBlocksActivation="false" />
+    <AutomaticBackgroundTask />
+  </UpdateSettings>
+</AppInstaller>
+

installer/README.md

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+# Packaging and updates
+
+`Decky.appinstaller.template` is the stable update-feed template. The release
+pipeline will replace its placeholders after producing and signing a versioned
+MSIX bundle.
+
+The final `PUBLIC_BASE_URL` must be an HTTPS location that Windows App Installer
+can read without an interactive sign-in. Package name and publisher must remain
+stable across releases, and `VERSION` must be a monotonically increasing
+four-part MSIX version such as `1.2.0.0`.
+
+The application project is temporarily configured as unpackaged so the first
+read-only shell can be developed before signing identity and public artifact URL
+are chosen. MSIX packaging becomes the release configuration, not a different
+application or update mechanism.